Power lift plow



A. C. LINDGREN. POWER LIFT PLOW.

Jan. 2, 1923.

3 SHEETS-SHEET I FILED APR. 30,1919- LMQQZ L,

A. c. LI'NDGREN.

Jan. 2, 1923.

Jan, 2, 1923.

A. c. LINDGRENQ- POWER LIFT PLOW.

3 SHEETS-SHEET 3- FILED APR. 30. I9I9- patented Jan. 2, W230 omit-enterates,

'- annxus c. rrnnennn, or Hammers, on'rARr -eananA, nssrereonl, "m2"ransren nssremrnms, 'ro ram) ennrncn AND ARNOLD B.- KELLER, 'rnu's'rnns,norm or CHICAGO, ILLINOIS.

rowan Lrrr r row j {application filed n rir 30,1919. "serial no. scarce.

To all, whom it may concern Be it known that I, ALExUs C. LINDGREN, acitizen of the United. States, residing at Hamilton, in the county ofWentworth and Province-of Ontario, Dominion of Canada, have inventedcertain new and useful Improvements in Power Lift Plows, of which thefollowing is a full, clear, and exact speclfication.

This invention relates to-plows and more particularly to power liftplows.

One of the objects of the invention is to facilitate the raising andlowering of theframe and plow shares with respect to the ound.

Another object is to improve the mecha-' nism including the controlparts for raising and lowering the frame and plow bases of a power liftplow, and to eflect such action by intermittently acting mechanism whichwill act positively both when raising and when lowering incontradistinction to pre Another object is to improve power lift plowsby providing the land and furrow wheels with crank axles so positionedthat there will be no tendencydn the raised position of the plow tocramp these wheels under the plow.

These and other objects are attained by, my invention which comprises apower lift plow having a frame, plow bases carried thereby, crank shaftsmounted on the frame, means for operatively connecting said crank axles,ground wheels journaled on the crank axles,

- clutch means connected to one of said wheels land Wheel axle andlifting connections.

a plow having three plow bases 10, 11 and and 1% for a rocking actionwith respect be hereinafter explained. To the lower end of the crank armis secured a bracket 23,

clutch element 26 driven in any suitab Fig. 3 is a side elevation of'thesame plow with the plow shares lowered into the ground;

Figure .4 isaf detail view showing the clutch arrangement whereby thepositive raising and lowering of the plow is accomplished; I

ig. 5. is a partial side elevation showing the furrowwheel and lever indetail.

Fig.- 6 is a detail front viewshowing the The various novel features ofmy invention will be apparent from the following description and thedrawings, and will be particularly pointed out in the appended claims.

I have chosen to illustrate my invention in connection with athree-bottom plow or 12, respectively, secured to beams 13,14 and. 15,whichare connected at their rear ends by '70 diagonal brace bars 16 and17. The front ends of beams 13 and 14 are connected by a U-shaped'bracket '18, and intermediate portions of the plow beams 13 and 1d areconnected by a cross brace 19. The front end of the plow beam 15 is bentlaterally and. se-. cured to an intermediate portion ofthe plow beam 14.Pivotally connected to the front end of the plow frame, which includesplow beams 13 and 14: is any suitable draft connection 20. Connected tothe plow beams 13 thereto is a crank shaft 21 having at one end thereofa forwardly and downwardly extending crank arm 22, whose function willjournaled in which is a transversely extending power shaft 24, on oneend of which is journaled'a land side wheel 25. The other end of thisshaft carries a crank whose function will hereinafter be explained.

On this shaft is jou'rnaled a rotatal'ole clutch element 26 havinginternal notches 2? as shown in dotted lines in Fig. 4:. The

manner, such as the lug 28, by the ground wheei Keyed o otherwisesecured to the shaft 24 is a normally stationary clutch ele-1 ment- 29,having a laterally extending hub 30 and. an arm 31 to which is pivotallyconnectedan arm 32 having a roller 33 pivotally mounted thereonwhich isadapted to engage the notches 27 in the rotatable clutch element 29; iThe hub 30 also has. an arm 31 to roller arm 37 and is adapted to engagethe internal notches 27 on the opposite side from those engaged by'theroller 33 and prevents reverse rotation of clutch element 26. The arm 34also is connected to the arm 32 by means of a link 38 so that therollers 33. and 33 are simultaneously moved into and out of engagementwith the internal notches 27.

The spring 39 tends to kee p the rollers in engagement.

he stationary clutch element 29 has two notches 40 and 41 unequallyspaced in its periphery, as explained later, and adapted to'be engagedby the roller 42 carried by the crank 43 which is journaled in thebracket 23..- A spring 44 tends to keep the roller 42 in engagement.Itwill be noted that the outer ends of-the arms 32. and 34 are held inthe retracted position when the roller 42 is seatedin the bottom of oneof the notches 40 or 41. .Thus the element 29 is held stationary and atthe' 's'ame time the clutch is held disengaged. j. The clutch is trippedby means of the trip rope 45 fastened to the lever 46 mounted onthecrank 43.

"The crank 24 on the inner end of-the power shaft 24'carries aconnecting rod 47 the-upper end of. which is connected to a depth?regulating lever 48 which is, pa e ally. connectedjto the frame at 49and'has adetent 50 which locks the lever "to a sec-v tor51.

The right-hand end of the crank shaft 21 is provided with an. upstandingarm 52 whichis connected by a link 53 to a segment 54 which is engagedby the detent 55-of a hand-operated lever 56, the latter of which isconnected to a crank shaft 57, one end of which is provided with afurrow wheel 58 which normally runs in a furrow. The

otherend of the. crank shaft 57 is parallel to the end carrying thefurrow wheel, both being set at an angle to the shaft21, and this shaftalso is connected to-the plow beams 13 and 14 for-a rocking action withres ect thereto.

- 11' Figure 3 of' thedrawings the plow shares are shown in a plowingposition 5 that is,-they are in the ground, and 'it will be noted thatthe depth levers are set for maxi mum depth andthat the crank arm 22 ofthe crank shaft 21 extends almost horizontally forward: with thelan'dside wheel 25 in a somewhat elevated position'with respectto the frameof the plowand also with respect to the plow bases. It willbe-seen thatthis construction permitsthe crank shafts" at the forward end of theplow to be kept at such I anan'gle to thevertical that the crank arms Icarrying the wheels will not be cramped and forced back underthe plowframe. This is particularly true when the frame is raised as shown inFig. 1. In that type of power lift plow having a crank which is nearlyvertical in the .raised position of'the plow, the tendency to cramp thepower wheel under the frame is sogreat that in many instances the plowwill not lower while it is being moved forward even when To raise theplow frame from'the posif tion shown in Figure 3 to that of Figure 1,the'operato'rpulls upon the rope orcable 45 and the roller 42 passes outof the. notch '40 in wh-ichfit is engaged and permits the rollers .33and 33 to engage any of the notchesv 27; and the relatively stationary.clutch member together with shaft 24 rotates with'the wheel 25 untilroller 42 enters notch: 40.; In like nianner withdrawin roller 42 fromnotch 40 sets the clutch in motiontolower the plow frame, but owing tothe'functionzofthe arm 37 and rolle'r33f,

of the clutch takes place in contradistinction reverse movement of theclutch is prevented ,andpo'sitivelowering of the frame by action todropping of theframe by its own weight f as inprevious constructions ofthis type.

, The notches. 40 and 41 on the stationary nember29 are spaced unequallysofthat they will-fall at points located so that the pawl roller 33 willdisengage in all positions of the adjusting levers just after the link47 has passed'the'dead center of the stationary member 29. Thisconstruction is particularly necessary where the fulcrum of the adjusting lever is offset from the crank shafts, as is the case in thisplow. As soon as the roller 42 is disengaged, the cable 43 may bereleased and the roller42 will ride over, the outer periphery of therelatively stationary clutch member and will then pass into en gagementwith the other notch 40 or 41 to throw the roller 33 out of engagementwith the notches 27 so as to prevent further movement of the relativelystationary clutch member; or, in other words, to prevent accidentallowering of the plow bases into the ground.

In order to raise the rear end of the plow frame and plow basesout ofthe ground, a

connection is provided between the crank shaft and the rear carryinwheel 59,

'which connection includes a link 60, the

front end of which is pivotally connected to an arm-61 on the crankshaft 21, the rear portion of the link being operatively' connectedthrough other links to the free end of a lever'62, the other end ofwhich is pivotally connected to the plow beam 15.;

.Pivoted intermediate the ends of the link 62 is a link 63 which isoperatively connected through a series of links to one arm of a bellcrank lever 64 which is suitably supported in a casting 65 secured tothe rear end. of the {plow beam 15. The other arm of the bell cranklever is pivotally'connected to .a hollow casting 66 in which is mountedthe yergtical stem 67 of the support 68 for the wheel 59 which isthereby given'a free swinging 'movement'. Surrounding the upper end ofthe stem and located intermediate the casting, but the rear end oftheframe is raised following-the raising movement of thefront end of theframe, that is .to say owing to the lost motion in straightening links63, the

' front end of the plow frame is first raised and then the rear end ofthe plow frame is raised, or, in other words, the points of the plowbases are first raised or tilted in an upward direction and then therear ends of theplow bases are raised. The operation of the raising ofthe front and rear ends of v the plow frame and the raising of the frontand rear ends of the plow bases may be said to be successive. Y

.The plow frame and bases are lowered mainly by their own weight butunder control of the action of the clutch. It will be noted that thedepth of the plows may be regulated by movement of the hand controllevers 48 and 56 with respect to their segments, but in the automaticmovements of raising and lowering, the hand levers are locked to theircooperating segments. Suitable counter-balancing springs 7 2 and 73 areoperatively connected respectively to the crank shafts 57 and 21 andadjustably connected with respect to the bracket 18 for assisting theraising of the plow bases and for preventing their dropping toosuddenly, and for taking excessigye strain oil the land} wheel inraising 1e plow bases.

By means of axis arrangement a simple and compact plow is provided whichis adapted to meet all the requirements for successful cenimercialoperation.

It is apparent that there may be modifications of the invention, and itis my intention to cover all such modifications which do not involve adeparture from'the spirit and scope of the invention as set forth in thefollowing claims.

1.- In apower lift plow, frame, plow bases carried thereby, crank axlesmounts-5.

on the frame with the cranks extending forward-ly, means for operativelyconnecting said crank axles, ground wheels journalefi on the crankaxles, and a clutch connected to one of said wheels and including meansfor positively raising and lowering the frame at a constant speedgoverned by rotation of said wheel.

r 2. ln a power lift plow, a frame, plow bases carried'thereby, crankaxles mounted on the frame with the cranks extending forwardly, meansfor operatively connecting said crank axles, ground wheels journaled onthe crank axles, and. intermittently operable lift mechanism connectingthe frame to one of said wheels, including means for oscillating theaxles at constant speed governed by rotation of said whe l to raise andlower the frame.

3. In a power lift plow, a frame, plow bases carried thereby, crankaxles mounted on the frame with the cranks extending forwardly, meansfor operatively connecting said axles, ground wheels ournaIed on thecrank axles, and a clutch connected one of said wheels including anelement rotatable jointly with said wheel during successive halfrevolutions, a link connected to said frame and eccentrioally connectedto said elem t and means for locking said element to said ."heel topositively shift the axles and effect a ternate raising and lowering ofthe plows.

4. 'lna power lift plow, a frame, plow bases carried thereby, crankedaxles journaled on the frame with the cranks extending forwardloperating connections between the ax es, supporting wheels on the axles,a power shaft journaled on one the axle cranks and provided with a crankarm on one end, a rigid link connecting said crank arm to the frame, andmeansfor intermittently locking said power; shaft to the supportingwheel for a fixed cycle of rotation in unison therewith, therebyalternately raising and lowering the plows at a constant speed.

5. In a power lift plow, a frame, transverse crank shafts mounted on theframe with 1 the cranks extending forwardly, wheels on the cranksthereof, adjusting levers mounted on the frame, at points in advance ofthe sirverse portions of the shafts and prov with links connected to thecranks thereofl a double acting .In" testimony whereof I afi'ixi mysigna-w power lift clutch connected to one of the ture. 1 wheels andgoverning the speed at which the frame is lifted and lowered by the ro-X -N 5 tation of said wheel, a link connection be.- Witne'sse's:

tween the clutch and one of the levers, and HELEN EDMONSTON,

a link connecting the crank shafts. Anon MCKENZIE.

